JP2007279338A - Device and method for processing video signal, and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a user to freely change a display color of an on-screen display without increasing a data amount of a CLUT. <P>SOLUTION: A video processing circuit 17 holds a CLUT for converting OSD display data into OSD color data. An operation input part 19 changes setting of the OSD display color. Also, a storage part 14 holds auxiliary data so that all the color data for the CLUT can be created by arithmetic operation based on change setting of a specific color of the CLUT inputted from the operation input part 19. Then, when a fundamental color of the OSD is changed, a control operation part 15 creates a new CLUT using the auxiliary data, and replaces the CLUT before change setting of the color data with the new CLUT. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video signal display device, a video signal processing method, and an image display device, and more particularly, a video signal processing device for performing color image display using a CLUT (color look-up table), and the same The present invention relates to an image display device that displays an image generated by a video signal processing device.

  2. Description of the Related Art An image display device that performs OSD display on a display screen by superimposing an OSD (on-screen display) signal such as a channel, audio, or time setting menu on an input video signal such as a broadcast program is known. . In such an image display apparatus, generally, an OSD image is generated using a CLUT (color look-up table).

The image display device holds bitmap data for OSD such as menu images. In the bitmap data, a color number (index number) is described. A video processing circuit or the like of the image display apparatus holds a CLUT that stores color data for actual screen display.
When OSD displaying a menu image or the like, the video processing circuit converts the OSD bitmap data into OSD color data according to the color number. The video processing circuit generates an OSD image according to the color data output from the CLUT, and displays the OSD image on the display screen by superimposing it on the video signal.

By generating the OSD color data using the above-described CLUT, it is possible to reduce the data transfer amount at the time of OSD drawing.
For example, when RGBA is used as a bitmap color system, each color is generally specified in n stages for each RGBA, and when CLUT is used with n = 256 as described above, compared to the case where CLUT is not used. Therefore, the data transfer amount becomes 1/4.

  With regard to the OSD image display technology using such a CLUT, for example, in Patent Document 1, in an OSD display circuit capable of displaying a plurality of OSDs on a moving image / still image in a multi-window, a simple operation by a CPU without having an OSD window management memory An OSD display circuit that performs multi-window display control of OSD by control is disclosed.

Here, the OSD display circuit includes a plurality of CLUTs that convert a plurality of OSDs to be displayed in a multi-window from bitmap data to color data, a window generation circuit that generates a window corresponding to each OSD, and outputs of these CLUTs. A plurality of switches for rearranging the signals and the output signals of the window generation circuit in the order of display priority of the OSD; and a switching circuit for switching and synthesizing the output signals of these switches in descending order of priority.
JP 2000-305549 A

  In general, the OSD display such as a menu in the image display apparatus is set so that the display color can be changed according to the user's preference or the like. Usually, a plurality of CLUTs are prepared in advance so that the OSD display color can be changed, and the CLUT to be used is switched when the OSD display color is changed.

However, the OSD display color can be changed only within the range of the CLUT prepared in advance, and there is a problem that the degree of freedom of the display color is limited.
In addition, preparing a plurality of CLUTs increases the amount of memory used, and excessively consumes a finite memory space. In order to improve the degree of freedom of display colors, it is not realistic from the viewpoint of cost and the like to prepare more CLUTs because the memory space has a larger number of CLUTs.

  In the OSD circuit of Patent Document 1, when n OSDs are switched and combined, the OSD data color and the display window are rearranged according to the display priority. By doing so, a plurality of OSD display controls can be performed. However, the configuration of the CLUT for coping with the OSD display color change as described above is not disclosed at all.

  The present invention has been made in view of the above circumstances, and a video signal processing device, a video signal processing method, and a video signal processing device that allow a user to freely change the display color of the OSD without increasing the data amount of the CLUT. It is another object of the present invention to provide an image display device.

  In order to solve the above-mentioned problem, a first technical means includes a video signal processing unit that holds a CLUT for converting OSD display data into OSD color data, an input means that enables a change setting of the OSD display color, and an input Based on the change setting of the specific color data of the CLUT input from the means, storage means for holding auxiliary data that can generate all the color data of the CLUT by calculation, and auxiliary data stored in the storage means are used. And a control operation unit that generates a new CLUT and replaces the new CLUT with the CLUT before the color data change setting.

  In the second technical means, in the first technical means, auxiliary data is set to data corresponding to each color number of the CLUT before the change, and each data includes the color number of the CLUT before the change and the intermediate color. A target color that is a target color to be generated, and a coefficient for defining a color mixture ratio for generating an intermediate color. = Color data indicated by original color number x coefficient + color data indicated by target color number x (1-coefficient) Calculates color data of all color numbers and generates a new CLUT. Is.

  A third technical means is a video signal processing method for converting OSD display data into OSD color data using a CLUT, wherein all the color data of the CLUT is based on a change setting of specific color data of the CLUT. Auxiliary data that can be generated by calculation is prepared in advance, a new CLUT is generated using the auxiliary data, and the new CLUT is replaced with the CLUT before the color data change setting.

  In the third technical means, data corresponding to each color number of the CLUT before the change is set as auxiliary data in the third technical means, and each data includes the color number of the CLUT before the change and an intermediate color. It has a color number of a target color to be a target color for generation and a coefficient for defining a color mixture ratio for generating an intermediate color, and the following calculation formula, new CLUT color data = original color number The color data of all the color numbers is calculated by the color data indicated by x × coefficient + the color data indicated by the target color number × (1−coefficient), and a new CLUT is generated.

  A fifth technical means includes a video signal processing device in the first or second technical means, an audio input unit for inputting an audio signal, and audio processing suitable for output from a speaker for the input audio signal. An image display device comprising: an audio processing circuit to be performed; a speaker that outputs an audio signal output from the audio processing circuit; a video input unit that inputs a video signal; and a display unit that displays an image. The apparatus is characterized in that the OSD image signal generated using the CLUT is superimposed on the video signal from the video input unit and output to the display unit.

According to the present invention, the user can freely change the OSD display color without increasing the data amount of the CLUT.
That is, according to the present invention, the data describing the generation method of the color data of each color number is held as auxiliary data of the CLUT, so that the user can freely select the OSD color without increasing the data amount related to the CLUT. be able to. As a result, a finite memory space can be saved and the configuration can be simplified.

FIG. 1 is a block diagram showing a configuration example of an embodiment of an image display device according to the present invention, and shows an example of a configuration to which an image processing device according to the present invention can be applied.
The image display device 10 includes an audio input unit 11, an audio processing circuit 12, a speaker 13, a storage unit 14, a control calculation unit 15, a video input unit 16, a video processing circuit 17, a display unit 18, and an operation input unit 19. These are connected to each other via a system bus 20. The operation of these elements is controlled by a control calculation unit 15 including a CPU and the like. The storage unit 14 is used for storage of data and programs, control processing by the control calculation unit 15, and the like.

  Such an image display device 10 can be applied to a television receiver, other AV devices, a PC, a mobile display device, and the like. An embodiment of the video processing apparatus according to the present invention is realized by the control calculation unit 15, the storage unit 14, the video processing circuit 17, and the operation input unit 19 in the image display device.

The audio signal input to the audio input unit 11 is subjected to decoding processing or the like by the audio processing circuit 12, and an audio signal suitable for audio output from the speaker 13 is generated. The speaker 13 outputs the sound signal as sound.
The video signal input to the video input unit 16 is processed by the video processing circuit 17 and output as a video signal that can be displayed on the display unit 18.

  The video processing circuit 17 holds a CLUT that realizes video processing according to the present invention. The video processing circuit 17 generates an OSD image such as a menu screen and superimposes the OSD image on the input video signal. The CLUT generates and outputs color data of the OSD image from the color number of the OSD data based on the bitmap held by the image display device 10. The video processing circuit 17 draws an OSD image using this color data, and superimposes it on the input video signal and outputs it to the display unit 18.

  When the color of the OSD display image is changed, the control calculation unit 15 follows the changed display color information from the CLUT set in the video processing circuit 17 and the auxiliary data stored in the storage unit 14, for example. A new CLUT is calculated and generated and replaced with the CLUT of the video processing circuit 17. As a result, the video processing circuit 17 can generate OSD color data based on the changed color by a new CLUT.

  The operation input unit 19 enables various inputs by user operation, and corresponds to, for example, a pointing device such as a mouse or a keyboard, a remote controller or a key switch or button of an operation panel. Or you may be comprised as an input part which receives the operation input from an external apparatus via a predetermined | prescribed interface and a communication line. By performing a user operation using the operation input unit 19, for example, a color setting menu on the OSD display screen can be displayed, and a user can select a display color. Input to the operation input unit 19 is processed by the control calculation unit 15. That is, the input means of the present invention corresponds to the operation input unit 19 of the present embodiment.

FIG. 2 is a diagram for explaining an example of setting the CLUT and auxiliary data as described above. FIG. 2A shows an example of setting the CLUT, and FIG. 2B shows an example of setting of auxiliary data. FIG.
As shown in FIG. 2A, the CLUT is preset by associating a color number (index number) with a color (color data). Here, 256-stage color data is set, and a CLUT is created in which 0 is colorless and transparent and 255 is yellow.

  As described above, the CLUT converts bitmap data such as a menu image into OSD color data. In this case, a color number is described in bitmap data such as a menu image, and the color data corresponding to the color number is output in the CLUT.

In the embodiment according to the present invention, auxiliary data describing a method for generating color data of each color number is held, so that even when the OSD display color is changed, a plurality of CLUTs are held and switched. There is no need, and the user can freely select a color.
In the present embodiment, as shown in FIG. 2B, the original color number, the target color number, and the coefficient are set in the auxiliary data. The auxiliary data is set in the same 256 steps as the CLUT in FIG. 2A, and auxiliary data at the same position corresponds to each data in the CLUT.

  When the user wants to change the OSD display color, the operation input unit 19 is used to change the specific basic color on the OSD screen to a desired color. As described above, for example, a menu for setting such a display color is prepared in advance, and the user can set the display color of the OSD screen by operating the menu.

  For example, OSD displays such as menu screens are often provided with buttons that can be operated with a pointing device or the like. As a feature of OSD screens where such buttons are used, when the background and color of the button surface are determined, the side and shadow of the button that looks three-dimensional are mostly drawn in the middle of these two colors. is there.

  Accordingly, after the user determines a basic color such as a background color, the intermediate color data used for the side surface of the button, the shadow portion, etc. is calculated using auxiliary data, so that the degree of freedom of color change in the conventional OSD is achieved. It is possible to suppress an increase in the amount of data that has occurred when the improvement is made.

For example, it is assumed that the user changes the basic color “blue” to “yellow” using the OSD display color setting menu. The basic color refers to a color having a coefficient of 1 in the auxiliary data. In the example shown in FIG. 2A, the basic colors that can be changed are colorless and transparent with color number 0, black with color number 1, white with color number 5, blue with color number 6, red with color number 8, The color number 254 is green, the color number 255 is yellow, and the like.
Here, in the current CLUT shown in FIG. 2A, the color number for outputting blue color data is color number 6. The control calculation unit 15 changes the color data of the color number 6 from blue to yellow according to the user operation, and calculates and rewrites all elements of the CLUT using the auxiliary data according to the change.

In this case, the color data of the new CLUT generated by the calculation is expressed by the following equation:
New CLUT color data = color data indicated by original color number × coefficient
+ Color data indicated by target color number × (1−coefficient) (1)
Is generated by calculation.

That is, in the above example, when the basic color blue is changed to yellow, the color data of color number 6 is changed from blue to yellow.
In this case, the original color number “6”, the target color number “−”, and the coefficient “1” are set at the position corresponding to the color number 6 of the CLUT in the auxiliary data. Therefore, in the above equation (1), the color data indicated by the original color number is changed from blue to yellow,
New CLUT color data = yellow x 1 (coefficient) = yellow (2)
Thus, yellow color data is output.

  Then, there is a color number 7 as a color number affected by the change of the color number 6. In the auxiliary data corresponding to the color number 7 of the CLUT, the original color number “6”, the target color number “8”, and the coefficient “0.5” are set. Here, color number 8 of the original CLUT is the basic color red, and the auxiliary data of color number 8 is not related to the change of the color data of color number 6 (blue to yellow). Maintained. Therefore, the color data of the target color number 8 of the auxiliary data corresponding to the color number 7 is red.

Therefore, according to the above formula (1), the purple color number 7 is changed from the original color number 6 to yellow.
New CLUT color data = Yellow × 0.5 + Red × (1−0.5) (3)
Thus, the color data of intermediate colors of red and yellow is obtained.

Similarly, in the auxiliary data corresponding to the color number 9 of the CLUT, the original color number “8”, the target color number “6”, and the coefficient “0.75” are set. The color data corresponding to the target color number 6 is yellow because it is changed from blue to yellow. The original color number “8” is an intermediate color between red and yellow according to the above equation (3).
Therefore, according to the above equation (1), the purple color of color number 7 is
New CLUT color data = red and yellow intermediate color × 0.75 + yellow × (1−0.75)
... (4)
As a result, intermediate color data close to yellow is generated.

  In other words, by having the target color number information and coefficient information in the auxiliary data, it is possible to generate an intermediate color between the color data corresponding to the target color number and the color data corresponding to the original color number. The color mixture ratio can be defined by a coefficient.

  In this case, for example, the color number 0 is not affected by the change from the basic color blue to yellow, and thus remains colorless and transparent, and the color number 1 also remains black. Similarly, color numbers 2, 3, 4, 5, and 254, 255 that are not affected by the change from blue to yellow remain the original color data of the CLUT.

  As described above, when the basic color set in the CLUT of the video processing circuit 17 is changed according to the user setting or the like, the control calculation unit 15 uses the auxiliary data prepared in advance and other than the CLUT. The color data is generated by calculation. All color data are calculated to generate a new CLUT, which is replaced with the original CLUT. As a result, the video processing circuit 17 can generate color data with the new CLUT that has been changed.

  Although the setting values of auxiliary data are predetermined, the setting values may be rewritten in accordance with a user operation or an instruction from an external device.

FIG. 3 is a flowchart for explaining a processing example when a new CLUT is generated from CLUT data and auxiliary data.
First, a basic color is designated (S1). This designates a predetermined basic color by user setting or the like as described above.

Then, by the loops S2 and S5, the following processes of S3 and S4 are repeated for the number of CLUT elements (256 in the example of FIG. 2), and the color data of all the elements are calculated.
In the calculation of each element, whether or not the coefficient of the auxiliary data is 1 is determined in S3. If the coefficient is 1, the color data indicated by the original color number is maintained, and the operation proceeds to the next element. Here, even if the coefficient is 1, if the color data is a basic color changed by user setting, the changed color data is used as new CLUT color data, and the processing of the next element is performed.

If the auxiliary data coefficient is not 1 in S3, the color data set in the CLUT and the auxiliary data are used, and the above equation (1), that is,
New CLUT color data = color data indicated by original color number × coefficient
+ Color data indicated by the target color number × (1−coefficient) (1)
Is used to calculate new CLUT color data (S3).

  Thus, when the color data for all elements in the CLUT is calculated and new CLUT data is generated, this CLUT data is transferred to the video processing circuit 17 and set as a CLUT used for color data generation (S6). ). As a result, the color of the OSD display is changed according to the user setting, and the color related to the changed color predetermined at this time is generated by calculation according to the changed color. For example, just by changing the surface or background color of the button as in the example above, the side and shadow color data of the button with the associated intermediate color is generated, and the entire screen is automatically changed to the same color as the changed color. Will be able to.

It is a block diagram which shows the structural example of one Embodiment of the image display apparatus by this invention. It is a figure for demonstrating the example of a setting of CLUT and auxiliary data. It is a flowchart for demonstrating the process example when producing | generating a new CLUT from the data of CLUT, and auxiliary data.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Image display apparatus, 11 ... Audio | voice input part, 12 ... Audio | voice processing circuit, 13 ... Speaker, 14 ... Memory | storage part, 15 ... Control calculating part, 16 ... Video | video input part, 17 ... Video processing circuit, 18 ... Display part, 19: Operation input unit, 20: System bus.

Claims (5)

A video signal processing unit holding a CLUT for converting OSD display data into OSD color data;
An input means for enabling change setting of the OSD display color;
Storage means for holding auxiliary data that can generate all the color data of the CLUT by calculation based on the change setting of the specific color data of the CLUT input from the input means;
A video signal processing apparatus comprising: a control arithmetic unit that generates a new CLUT using the auxiliary data stored in the storage unit, and replaces the new CLUT with a CLUT before color data change setting. . The video signal processing device according to claim 1,
As the auxiliary data, data corresponding to each color number of the CLUT before the change is set, and each data includes a color number of the CLUT before the change and a target color which is a target color for generating an intermediate color. A color number and a coefficient for defining a color mixture ratio for generating an intermediate color;
The control calculation unit has the following calculation formula:
Color data of the new CLUT = color data indicated by the original color number × coefficient + color data indicated by the target color number × (1−coefficient)
A video signal processing apparatus that calculates color data of all the color numbers and generates the new CLUT. A video signal processing method for converting OSD display data into OSD color data using a CLUT,
Auxiliary data is prepared in advance so that all color data of the CLUT can be generated by calculation based on the change setting of the specific color data of the CLUT.
A video signal processing method comprising: generating a new CLUT using the auxiliary data; and replacing the new CLUT with a CLUT before color data change setting. The video signal processing method according to claim 3.
As the auxiliary data, data corresponding to each color number of the CLUT before the change is set, and each data includes a color number of the CLUT before the change and a target color which is a target color for generating an intermediate color. A color number and a coefficient for defining a color mixture ratio for generating an intermediate color;
The following formula:
Color data of the new CLUT = color data indicated by the original color number × coefficient + color data indicated by the target color number × (1−coefficient)
A video signal processing method comprising: calculating color data of all color numbers and generating the new CLUT. The video signal processing apparatus according to claim 1, an audio input unit that inputs an audio signal, an audio processing circuit that performs audio processing suitable for output from a speaker on the input audio signal, and audio processing An image display device having a speaker that outputs an audio signal output from a circuit, a video input unit that inputs a video signal, and a display unit that displays an image,
The video signal processing apparatus superimposes an OSD image signal generated using the CLUT on a video signal from the video input unit, and outputs the superimposed signal to the display unit.

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